Sash-lock.



I. L. DEMPSEY.

SASH LOOK. APPLICATION FILED MAR. 7, 1913. 1,681,585, Patented Dec. 16,1913. 7210 i F g 2 2:.

IRVING Id. DEMPSEY, OF GALENA, MARYLAND.

SASI-I-LOCK.

Specification of Letters Patent- Application filed March 7, 1913.SerialNo. 752,800.

To all whom it may concern Be it known that I, IRVING L. DEMPSEY,

citizen of the United States, residing at Galena, in the county of KentandState of Maryland, have invented certain new and useful Improvementsin Sash-Locks, of which the following is a specification.

My invention relates to window latches or looks, and particularly tothat'variety of latch which is used forholding a window sash at variouselevations.

The object of my invention is to provide a latch or look of extremelysimple construction, neat in appearance and, when placed upon a'sash,entirely out of the way, which lock'will automatically hold the windowat any height to which it israised and which can be so set'at any pointin the movement of the sash that the window can neither be raised norlowered, or which can be so set that the window will be automaticallylocked every time it is lowered so that it can not be raised from theoutside, or so set that every time it is raised it can not be againlowered until the lock is properly adjusted.

Other objects and advantages will appear in the course of the followingdescription.

My invention is illustrated in the accompanying drawings wherein:

Figure l is a perspective'view of a portion of a window sash with myimproved sash locking device in place thereon, the device being set tolock thewindow against movement either up or down. Fig. 2 is a sectionalview of the side bar of the window sash and a portion of the windowcasing, showing the parts so set that the window will be locked fromupward movement but will be free to be moved downward. Fig. 3 isaperspective view of a portion of the side rail of a window sash showingthe look casing and look but with the front plate and actuating deviceremoved. Fig. is a perspective view ofthe front plate and the actuatingdevice thereon.

Corresponding and like parts are referred to in the drawings by the samereference characters.

Referring to the figures, A indicates one of the side rails of a windowsash and B the corresponding portion of a sash channel or window'framewithin which the sash moves. The sash is cut away on its outside face asat 2 to permit the positioning'of my improved sashlocking device. Thecase of the sash lockconsists of a base plate 3whichhas outwardlyextending flanges 4: at opposite ends, these flanges extending outwardat right angles to the plate 8 and being then bent laterally as at 5 andprovided with openings 6 for the insertion of screws holding the base ofthe casing in place. The walls of the recess 2 in the window sash arechamfered for the accommodation of the flanges 5. The other section ofthe case comprises a face plate 7 provided on one edge with an inwardlyturned flange 8 which forms the front edge of the casing, this flangebeing cut away at the points 9 on each side-of the middle to permit theprojection of the locking cams.

t will be noted that the edge of the plate 3 is cut away at 10 toreceive the middle portion 11 of the flange 8 and that the plate 3 isalso cut at its ends as at 12 to receive the end portions 13 of thisflange 8. The plate 7 is held to the base portion of the casing by meansof screws 14: passing through openings 6 and 15 and into the wood of thewindow sash.

While I have illustrated what I deem to be the best form of casing, I donot wish to be limited thereto as it is obvious that it may be changedin many ways.

Projecting outward from the base plate 3 are the posts 16, and rotatablymounted upon these posts are the cams 17 and 18. Each cam is formed witha tail 19 which extends rearward and toward the central plane of thecasing as illustrated in Fig. 2, and surrounding each post is a coilspring 20, one end of which engages a projection on the outer face ofthe corresponding cam, the other end of the spring being extendedrearward into the casing and bearing against the end wall thereof.Preferably I form the cams with slots within which the tail members 19are inserted, these tail members consisting of strips projecting outwardfrom the face of the cam as illustrated in Fig. 3 and the hooked end ofthe spring 20 engages over this laterally projecting portion of thetail.

The face of the plate 7 is depressed as at 21, this depression beingpreferably, though not necessarily, circular in form, and passingcentrally through this depression is a post 22 carrying at its outer enda transversely extending handle or finger piece 23 which is housedwithin the depression 21. The inner end of the post projects through thefloor of the depressed portion 21 and at- Patented Dec. 16,1913...

tached thereto is a three-armed actuating member designated 24 asillustrated in Fig. 1. These arms are arranged equidistantly and radiatefrom the aXial center of the member 24. Two of these arms at theirextremities are inwardly turned or bent as at 25 so as to engage thetails 19 of the cams. Stops 26 are preferably struck vfrom the floor ofthe sunken portion 21 so as to limit the rotation of this member 2 1. Astop 27 is struck up from the plate 3 at the middle thereof and inadvance of a plane cutting the posts 16. The springs 20 act to urge thecams into such position that their tails 19 will engage this stop 27,the cams then being in the position shown in Fig. 3.

The operation of this invention is as follows. W hen the cams are in theposition shown in Figs. 1 and 3, that is equally projected, the sash islocked and can neither be moved up nor down for the reason that if it isattempted to move the window down, the uppermost cam will wedge outwardagainst the window and absolutely prevent any downward movement thereof,while if the sash is attempted to be moved upward, the lowermost camwill operate in the same manner and wedge against the frame, thusholding the window stationary. In this position of the parts, the lugs25 engage in front of each of the tails l9 and the cams are free to turnwithout affecting the member 24. If now it is desired to permit thewindow to be shifted downward but to lock the window from any upwardmovement, the parts are turned to the position shown in Fig. 2, that is,the handle 23 is rotated so as to carry the lug 25 of one of the radialarms into engagement with the tail of the uppermost cam which willrotate this cam to the position shown in Fig. 2. This will shift the cam17 out of operative engagement with the window casing but will leave thecam 18 free to act. As a consequence the window may move downward but islocked from any upward movement for as soon as any upward movementoccurs, the cam 18 will tend to rotate into even tighter wedgingengagement with the window casing than if no attempt is made to raisethe window.

If it is desired to so arrange the parts that the window may be raisedbut can not be lowered, then the handle 26 is turned in a directionreverse to that in Fig. 2 so that the tail 19 of the cam 18 is engagedby the turned down end 25 of one of the arms, thus rotating the cam 18to an inoperative position but permitting the cam 17 to act.

lVith the parts in the position shown in Fig. 2 it is obvious that thewindow may be lowered and that when left in this lowered position it cannot be raised, thus providing for automatically locking the window everytime it is lowered so that it can not be raised from the outside, andautomatically locking the window when it is raised so that it can not belowered exceptby resetting the looking device. My improved lock thuspermits in one position the window to be raised but not lowered, inanother position it permits the window to be lowered but not raised, andin a third position permits neither the raising nor the lowering of thewindow until the parts are properly set.

It will be noted from Fig. 2 that the stops 26 are so placed that theactuating member 24 can only turn through a limited distance and thatthe stops prevent either one of the arms carrying the lugs 25 fromturning so far rearward that either lug will escape beyond the end ofthe tail 19 of the corresponding cam. Thus in Fig. 2 the lug 25 on thearm which actuates the cam 17 is disposed so that the extremity of thetail 19 engages against the middle of the lug 25 and the actuatingdevice can not move any I farther 1n the direction of the arrow in Fig.2. The arm. 19 is somewhat resilient to permit the lug 25 to ride overits end. If the arm carrying lug 25 could move farther rearward than theposition shown in Fig. 2, the tail 19 would escape beyond the insideface of the lug 25 and would prevent any return of the arm. Furthermoreif the lug 25 could not move so as to cause the tail 19 to bear againstits face, the spring 20 would tend to return the parts to the positionshown in Fig. 3 immediately that the handle or finger piece 23 wasreleased. By arranging the parts as illustrated, however, either camwill be locked in its retracted position when the actuating member isturned to fully withdraw either cam.

I do not wish to be limited to having the tails 19 made separate fromthe cams 17 and 18 as they might be made integral therewith, but this ispreferable for the reason that thereby I can secure the slightresilience in the tail of the cam which is necessary for the mostoperative structure.

That portion of each peripheral cam face which is most nearly eccentricto the corresponding post 16 is smooth as at a, while that portion ofthe cam which is most eccentric to the post and which has binding orwedging engagement against the window casing is roughened or knurled asat 6. Thus when the cams are turned to their inoperative positions, theface a will be opposed to the window frame and there will be very littlefrictional resistance. When, however, either of the cams is outwardlyprojected, its knurled face will be opposed to the sash channel and willcause it to have frictional resistance with the face of the channel.

What I claim is:

1. A window sash lock including a cas- I ing, opposed cams eccentricallymounted,

springs for urging said cams to a projected position beyond the edge ofthe lock casing, and a rotatable handle including an actuating devicehaving outwardly divergent arms engageable respectively with said camsto rotate one of the cams to an inoperative position when the handle isturned in one direction and rotate the other of said cams to aninoperative position when the handle is turned in the other direction,and means on the actuating device for holding the cam with which the armis engaged from accidental return movement.

2. A window sash lock including a casing, opposed cams eccentricallymounted therein, each having a rearwardly projecting tail, the tailsnormally extending toward each other, springs for urgin said cams to aprojected position beyond the edge of the casing, and an actuatingmember including outwardly diverging arms engageable with the tails ofthe said cams, said handle when rotated in one direction engaging thetail of one of the cams and rotating it to a retracted position and whenrotated in the opposite direction engaging the tail of the other cam androtating it to a retracted position, each of said arms having meansthereon engageable with the tail of the cam to hold the cam in retractedposition from accidental return movement.

3. A window sash lock including a casing, an eccentrically mounted camdisposed in the casing, a spring rotating the cam to a projectedposition beyond the edge of the casing, a tail projecting from the camand having a laterally bent end, and a rotatable handle having aradially projecting arm formed with a lug at its extremity, said lugwhen the handle is rotated engaging with the tail to rotate the cam froma projected to a retracted position, the casing being formed with a stoplimiting the rotation of the arm to a position where the extremity ofthe tail will engage with the face of the lug.

at. A window sash lock including a casing, opposed eccentrically mountedcams pivotally supported within the casing, that portion of theperipheral face of each cam which is most concentric to its axis ofrotation being smooth, while that portion of each peripheral face whichis eccentric to the center of rotation being roughened, a tailprojecting rearward from each cam, said tails being extended rearwardand curved toward each other and the middle plane of the casing, a stopformed upon the front of the casing with which said tails contact whenthe cams are projected, springs urging the cams to a projected position,and an actuating device including a handle, a rotatable post mountedwithin the casing, and radially projecting arms, each arm having adownwardly bent lug at its extremity normally extending in front of thecorresponding tail, the face plate being provided with stops limitingthe rotative movement of the handle to such position in either directionas will bring one of the lugs into engagement with the end of thecorresponding tail.

5. A window sash lock including a casing, the face of the casing beingformed with a depressed central portion, opposed cams eccentricallymounted within the casing and each having a rearwardly projecting tail,said tails extending toward the middle plane of the casing, a rotatablehandle mounted within the depressed portion of the face of the casingand having a post entering the casing, radial arms mounted upon the postand extending over said tails and toward the front of the casing, eacharm having a lug at its extremity disposed in front of a correspondingtail, springs urging the cams to a projected position, a stop limitingthe forward movement of the tails, and stops limiting the rotativemovement of the arms rearward in either direction to such position aswill bring the lugs in contact with the ends of the tails.

In testimony whereof I aflix my signature in presence of two witnesses.

IRVING L. DEMPSEY. [L. 8.]

Witnesses:

OLIN S. DAVIS, GUY EVERETT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

